Foam 3D Letters Guide
Foam 3D Letters Guide

FOAM 3D LETTER QUALITY GUIDE — EPS VS HDU AND WHY IT MATTERS OUTDOORS

EPS foam absorbs moisture and crumbles outdoors. HDU foam is a completely different material used in architectural signage worldwide. The tier system separates the materials so you choose correctly.

Premium vinyl shopfront sign installed on glass vibrant clean edges Perth - Neon Brothers
ESSENTIAL
ESSENTIAL

ESSENTIAL — EPS FOAM (INDOOR ONLY)

Who it is for: Who it's for: Temporary displays, indoor activations, budget interior signage.

EPS foam — porous, absorbs moisture, crumbles outdoors. 1-coat enamel. 50mm depth. No lighting. Adhesive tape.

Spec at a glance
EPS · Indoor only · 1-coat enamel · 50mm · No light · Adhesive tape
Essential tier vinyl sign example - Neon Brothers
PREMIUM
PREMIUM

PREMIUM — HDU FOAM (OUTDOOR SHELTERED)

Who it is for: Who it's for: Retail facades, outdoor sheltered entries, restaurant signage.

HDU foam — does not absorb moisture. Crisp edges over years of outdoor exposure. 2-coat primer + enamel. 80mm depth. Tier-1 LED backlit option. SS304 blind stud.

Spec at a glance
HDU · Water resistant · 2-coat primer + enamel · 80mm · Backlit option · SS304 stud
Premium tier vinyl sign example - Neon Brothers
ELITE
ELITE

ELITE — ARCHITECTURAL HDU (FULL OUTDOOR)

Who it is for: Who it's for: Large-format commercial, building facades, full outdoor installations.

Architectural HDU 30 lb density — highest grade. 3-coat paint: primer + automotive enamel + UV lacquer. 100mm depth. Samsung equiv LED + Meanwell driver for backlit. SS316 concealed stud + laser-cut backing plate.

Spec at a glance
HDU 30 lb · 3-coat + UV lacquer · 100mm · Samsung + Meanwell · SS316 concealed stud
Elite tier vinyl sign example - Neon Brothers
Side by Side
Side by Side

SIDE-BY-SIDE COMPARISON

Spec Essential Premium ★ Elite
Foam Type EPS — indoor only HDU — outdoor sheltered HDU architectural 30 lb — full outdoor
Surface Coat 1-coat enamel 2-coat primer + enamel 3-coat primer + automotive + UV lacquer
Depth 50mm 80mm 100mm
Lighting No light Tier-1 LED backlit option Samsung equiv + Meanwell
Mounting Adhesive tape SS304 blind stud SS316 concealed stud + backing plate
Warranty 1 year 2-year NBCare™ 2-year NBCare™
Three vinyl signs comparison showing quality differences over time - Neon Brothers
FAQ
FAQ

FOAM 3D LETTERS — FAQ

EPS vs HDU foam?+
EPS: porous, absorbs moisture, crumbles outdoors. HDU: dense, water-resistant, holds crisp edges for years. Completely different materials.
Can EPS go outdoors?+
No. Rain, humidity, and coastal air degrade EPS in 6–12 months. Indoor only.
What is 30 lb density HDU?+
Highest grade — extremely dense, sharpest edge detail, withstands full outdoor exposure for 10+ years when properly coated.
Why does depth matter?+
50mm: flat. 80mm: visible shadow and 3D presence. 100mm: maximum visual weight for large-format building signs.
What is the 3-coat paint system?+
Primer (bonds to HDU) + automotive enamel (rich colour) + UV lacquer (protects against fade). Same system used in automotive refinishing.
Can foam letters be backlit?+
EPS: no. HDU Premium: yes, Tier-1 LED backlit option. HDU Elite: Samsung + Meanwell for the most even backlighting.
Do you ship signs Australia-wide?+
Yes. All signs are custom made and shipped tracked to any address in Australia — Perth, Sydney, Melbourne, Brisbane, Adelaide, and regional areas. Signs are packed flat with protective backing to prevent damage during transit.
How long do foam letters last outdoors?+
EPS: 6–12 months. HDU sheltered: 5–10 years. Architectural HDU 30 lb + UV lacquer: 10–15+ years.
BROTHERS

OUTDOOR FOAM SIGN? ALWAYS CHOOSE HDU

Tell us indoor, sheltered outdoor, or full outdoor — we recommend the right foam grade, depth, and paint system.

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